Thanks Peakey. I'm still a little confused, sorry
I understand the integrator part and that bit appears to be okay, but with regards to the layshaft diff, which bit is acting as the diff? The inner layshaft balls and rings or the spur gear balls and rings or both?
I was using the nut on the layshaft by the spur to tighten the diff action - is that wrong and I should just use the approach you described?